An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
Super Nintendo and Sega Genesis had an online multiplayer mode.
-2
The cigarette lighter was invented before the match.
210
Scientists in the UK are creating a smartphone app that will enable users to test for STDs.
0
First four countries to have television: England, the U.S., the U.S.S.R., and Brazil.
47
A fully loaded supertanker traveling at normal speed takes a least twenty minutes to stop.
27
A small airplane can fly backwards.
75
